There are a lot of 'if I knew then what I knew now' issues here. Unfortunately, that's the way it is. We often learn through our mistakes and problems and benefit from those o f others. In this case, well, 'if I knew then what I know now' sure fits the bill.

I sold the 100NX to a fellow RC'er, and a fellow RCU'er. He got it, ran it, and loves it. I could never get it to run right in spite of all my efforts. But, I found that I needed a little more patients. He ran it and played with the carb and got it to run much better than I ever could.

Ah, such is life. The O'Ring thing would have probably cured most of my problems with that engine. And, from what I understand, so would an $80 carb replacement... however, that would have put the Evo 100 NX in the price range of the replacement I chose, an OS 1.20 AX, which, I might add, ran perfectly right out of the box and still serves me well.

CGr.